Thanks for looking into the annual ROI! It really puts things into perspective.

Would be interesting to see the users getting high ROIs (above 20 or 30%) from self upvoting comments. My perception is that there are a lot of users getting over 20%...and it's most likely users with less SP Power that are under the radar of the min dollar value you may have set. Some are even borrowing SP via delegation to self upvote like crazy.